文章列表

• 1.Local Area Network 局域网
• There are two categories of networks: local area networks (LANs) and wide area networks (WANs). Here I'd like to mainly talk about LAN. A LAN is a sys...
• 2.What is digital TV?
• Digital television is based on the idea of recording information in a digital, rather than an analogue format（模拟形式）. The idea is to reduce the i...
• 3.A temperature change on the moon
• Astronomers can tell just how hot the surface of the moon gets. The side of the moon toward the sun gets two degrees hotter than boiling water. The ni...
• 4.Time Zonesand the International Date Line
• Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, one hour apart.You can have days with more or...
• 5.Strong and gentle Shetlands
• When is a horse a pony? Horses are measured in hands：one hand equals 4 inches.The height of a horse is measured from the ground to the highest point ...
• 6.When people began to eat with the fork
• Fingers were made before forks.When a person gives up good manners, puts aside knife and fork, and dives into his food, someone is likely to repeat th...
• 7.The air-cushioned vehicle 气垫船
• The air-cushioned vehicle is not an airplane, since it does not have wings.It is neither a ship nor an automobile, since it travels clear of sea and l...
• 8.Switches and Fuses 开关和保险丝
• An electric switch is often on a wall near the door of a room. Two wires lead to the lamp in the room. The switch is fixed in one of them. The switch ...
• 9.New Fingerprint Technology Developed
• Los Alamos National Laboratory scientists are using a new technique to see fingerprints on surfaces that typically make them invisible. The method use...
• 10.Wearable computers you can slip into
• The latest generation of these ever-smarter garments look like ordinary clothes, assembled together with Velcro that conducts electricity, these piece...